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(Post Link) post #1 of 2 Old 12-05-09 Thread Starter
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Join Date: Aug 2004
Location: Navan, Ireland
Posts: 116
Overboosting JTDm

JTDm has been plagued with overboosting for a while now and I can't get to the bottom of it. I've gone thru the various guides on here but to no avail.
Alfadiag reports error code P0238. Tried to take some live readings of overboost occurring but alfadiag keeps dropping the connection when the engine starts..

I've checked that the turbo vanes are moving, on idle pulling the vacuum hose the actuator does move back to the low boost position and returns to full boost position when reconnected.

The VNT solenoid was replaced as the original one was faulty, thought was would fix it but no.. so the MAP sensor was replaced with a new one and still overboosting.

The EGR has been stripped and cleaned out as well. Is there anything else to check out ??
Does the MAF sensor play any part is this ??

Last edited by fluffy; 12-05-09 at 08:41.
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Join Date: Aug 2003
Location: Ireland
County: Cork
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Re: Overboosting JTDm

Have you tried posting about this problem it the 156 Tech Lounge ?
You'll probably get more replies there
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